• English
    • Deutsch
View Item 
  •   OPARU Home
  • Medizinische Fakultät
  • Publikationen
  • View Item
  •   OPARU Home
  • Medizinische Fakultät
  • Publikationen
  • View Item
  • English 
    • English
    • Deutsch
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.

Respiratory and cardiac self-gated radial MRI

Thumbnail
Download
vts_9924_15130.pdf (14.02Mb)
65 S.
 
Veröffentlichung
2016-02-05
DOI
10.18725/OPARU-3800
Dissertation


Authors
Paul, Jan
Faculties
Medizinische Fakultät
License
Standard
https://oparu.uni-ulm.de/xmlui/license_v3
Abstract
Motion in cardiac Magnetic Resonance Imaging (MRI) is a major challenge, as it results in artifacts like image blurring if not compensated for. Respiratory motion of the heart can be addressed by acquisitions during breath-hold for scan times shorter than 10–15 seconds. When longer scans are required, only data from end-expiration is used. Determination of the respiratory position is typically achieved via interleaved Respiratory Navigator (RNAV) measurements. Self-Gating (SG) is an alternative method for generating a respiration signal, overcoming some of the challenges associated with the traditional method. Measurement of motion velocities during the heartbeat via Tissue Phase Mapping (TPM) MRI intrinsically requires long acquisition times and thus necessitates consideration of respiratory motion. The heartbeat itself also has to be considered to achieve time-resolved cine movies of the beating heart. SG can also be applied for cardiac synchronization as an alternative to the traditional method of Electrocardiogram (ECG)-based gating. Furthermore, cardiac SG can be extended to be able to resolve non-uniform cardiac motion, e.g. in case of arrhythmia. In this thesis, image-based SG was shown to yield good breathing information and image quality over a variety of sequence parameters and in combination with TPM acquisitions. For cardiac synchronization, SG signals could also be extracted successfully. Additionally, it was shown that the standard method of cardiac synchronization led to deteriorated images in case of arrhythmia. SG was successfully extended to Non-Uniform SG (nuSG) to be able to handle non-uniform motion, thus combining the advantages of good Signal to Noise Ratio (SNR) (as in gated cine imaging) and the temporal definition of real-time imaging (showing each - possibly irregular - motion cycle individually rather than an average cycle).
Date created
2015
Subject Headings
Kernspintomografie [GND]
Heart [MeSH]
Magnetic resonance imaging [MeSH]
Keywords
Cardiac motion; Compressed Sensing (CS); Golden angle; Respiratory motion; Self-gating; Tissue phase mapping (TPM)
Dewey Decimal Group
DDC 570 / Life sciences

Metadata
Show full item record

Citation example

Paul, Jan (2016): Respiratory and cardiac self-gated radial MRI. Open Access Repositorium der Universität Ulm. Dissertation. http://dx.doi.org/10.18725/OPARU-3800

Other citation formats



About OPARU | Contact Us
Impressum | Privacy statement
 

 

Advanced Search

Browse

All of OPARUCommunities & CollectionsFacultiesInstitutionsPersonsResource typesUlm SerialsDewey Decimal ClassesFundingThis CollectionFacultiesInstitutionsPersonsResource typesUlm SerialsDewey Decimal ClassesFunding

My Account

LoginRegister

Statistics

View Usage Statistics

About OPARU | Contact Us
Impressum | Privacy statement